Ok, I'll try to explain my problem.
I have 7 tabs with about about 100 components (Buttons, Sliders). This components I create at app startup (invisible), but only the visible ones will be painted on startup and all the others I have to paint on it's first visible time (tab switch) - this takes about a second (on iPad3) and this is to much.
Now I render all that components in a image at startup and if the component comes visible I use that image to paint it. This takes about 0.25 secs on a tab switch (not measured, but considerably faster :-) ). All the images cost me about 5mb and thats is ok for me (app size ~15mb in ram now).
I think my painting routines are simple (e.g I use. a simplified drawRotarySlider() of your L&Fv2 implementation) and it's really not a problem on Linux, Windows or Mac - just the iPad3 with the retina display is very very slow.
Do you not think this is a solution in this case?